I'm only 1/3 of the way through this very deep article, and have already gained some remarkable insights into obscure things like why my sugars are always high in the morning (liver actually generates sugar along with what you eat), and why my endo is always checking my Thyroid (indicates insulin resistance & liver failure from it). This article is ENORMOUS! It is pretty dated, but touches on just about every metabolic disease you can suffer from and how it all ties in to how your body responds to insulin.
When you have an hour of quiet to really focus, give this a read:
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